Table 4.

Univariate associations between baseline variables and rate of change in physical performance

Variable		SPPB		6MWD		Grip (men and women)
		r	p	r	P	r	p
Age (years)		− 0.11	0.17	− 0.08	0.31	− 0.11	0.18
Cystatin C (mg/l)		− 0.01	0.95	− 0.02	0.85	0.00	0.98
Creatinine (μmol/l)		− 0.02	0.79	− 0.05	0.54	0.00	0.98
Bicarbonate (mmol/l)		− 0.05	0.53	0.09	0.28	0.05	0.52
BMI (kg/m2)		− 0.04	0.61	− 0.09	0.26	0.05	0.54
eGFR by MDRD4 (ml/min/1.73m2)		− 0.02	0.82	0.05	0.57	0.07	0.35
25OHD (nmol/l)		0.01	0.95	0.15	0.06	− 0.05	0.56
NT-pro-BNP (pg/ml)		− 0.08	0.32	− 0.09	0.28	0.00	0.98
Albumin (g/l)		− 0.01	0.87	0.06	0.46	− 0.11	0.16
Haemoglobin (g/dl)		− 0.05	0.55	0.11	0.16	0.05	0.54
Phosphate (mmol/l)		− 0.06	0.50	− 0.09	0.25	− 0.08	0.34
		Mean (points per month) (SD)	p	Mean (m per month) (SD)	P	Mean (Kg per month) (SD)	p
Sex	Men	− 0.03 (− 0.07 to 0.01)	0.21	− 3.0 (− 5.0 to − 1.0)	0.56	− 0.04 (− 0.15 to 0.07)	0.08
	Women	0.02 (− 0.05 to 0.08)		− 1.8 (− 5.1 to 1.5)		− 0.26 (− 0.46 to − 0.06)

Partial correlations, adjusting for baseline value of physical performance measure in each analysis

SPPB Short Physical Performance Battery, 6WMD Six-minute walk distance, BMI body mass index, eGFR estimated glomerular filtration rate, 25OHD 25-hydroxyvitamin D, NT-pro-BNP N-terminal pro B-type natriuretic peptide